In this paper, we explore chromatic numbers subject to various local modular constraints. For fixed n, we consider proper integer colorings of a graph G for which the closed and open neighborhood sums have nonzero remainders modulo n and provide bounds for the associated chromatic numbers χₙ (G) and χ (₍) (G), respectively. In addition, we provide bounds for χ (₍, ₊) (G), the minimal order of a proper integer coloring of G with open neighborhood sums congruent to k n (when such a coloring exists) as well as precise values for certain families of graphs.
Herden et al. (Sat,) studied this question.
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